Ship may have to wait for days before finding a time when incoming waves and tidal currents are right, permitting them to enter the harbor with safety.

船只必须等待多日才能等到合适的波和潮流，从而使得它们能安全地进港。

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An artificially enclosed area of a river or harbor designed so that the water level remains unaffected by tidal changes.

内港，内湾：留作河流或港口专用的人工围起的区域，潮水变化不致使水位受影响。

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The villains of the tidal story were the harbor masters who hoarded their information, but in fact that was only a small part of the value they offered.

FORBES: What the Victorian Age Can Teach Us About Data